How to Accurately Measure a Euro-Profile Cylinder for Replacement

Introduction

Replacing a Euro-profile cylinder can enhance your door's security and functionality. Accurate measurement is crucial to ensure a perfect fit. Follow this step-by-step guide to measure your cylinder correctly.

Step-by-Step Measurement Guide

1. Open the Door: Begin by opening the door to access the cylinder.
2. Locate the Fixing Screw: Find the cylinder’s fixing screw on the edge of the door, typically aligned with the keyhole.
3. Measure Measurement A: Use a ruler to measure from the center of the fixing screw to the outer face of the door handle or escutcheon. This measurement is referred to as A.
4. Measure Measurement B: Next, measure from the same center point to the inside face of the handle or escutcheon. This is your B measurement.
5. Order Your Cylinder: When ordering, specify the cylinder size as A/B. For example, if A is 35 mm and B is 40 mm, you would order a 35/40 mm cylinder.

Important Considerations

• Measure to the Outer Faces: Ensure you measure to the outer faces of the fitted handles, not just the door itself.
• Identify Exterior Measurement: Clearly identify which measurement is exterior, especially when ordering a thumb-turn cylinder.
• Exclude Projections: Do not include the projecting thumb-turn or key section in your measurements.
• Flush Fit: The cylinder should sit flush with the handle or project no more than 2–3 mm.
• Common Size Increments: Sizes are typically available in 5 mm increments.
• Cross-Check Total Length: The total body length of the cylinder should equal A + B for accuracy.

Removing the Existing Cylinder

For easier measurement, consider removing the existing cylinder:

1. Undo the fixing screw.
2. Insert the key and turn it slightly to align the central cam.
3. Gently slide the cylinder out. Avoid forcing it to prevent damage.

Conclusion

By following these steps, you can ensure that you measure your Euro-profile cylinder accurately, leading to a successful replacement. Proper measurement not only enhances security but also ensures the longevity of your door hardware.